Harry it



(No Model.)

H. H. BLADES. GOMMUTATOR.

Patented May 28, 1889.

UVVEJVTO? WITNESSES n. wcrzn. MW

UNITED STATES PATENT OFFICE.

HARRY H. BLADES, OF DETROIT, MICHIGAN, ASSIGNOR TO THE DETROIT MOTORCOMPANY, OF SAME PLACE.

COMMUTATOR.

SPECIFICATION forming part of Letters Patent No. 403,905, dated May 28,1889.

Application filed September 25, 1888. Serial No. 286,358. (No model.)

To all whom, it may concern:

Be it known that I, HARRY II. BLADES, a citizen of the United States,residing at Detroit, county of lVaync, State of Michigan, have inventeda certain new and useful Improvement in Commutators; andl declare thefollowing to be a full, clear, and exact description of the same, suchas will enable others skilled in the art to which it appertains to makeand use the same, reference being had to the accompanying drawings,which form a part of this specification.

In the drawings, Figure 1 is a perspective view of a commutatorembodying my invention. Fig. 2 is a sectional view on the line x at;Fig. 3, a sectional view 011 the line 111 and Fig. 4 a longitudinalsectional view.

This invention has for its object to produce a commutator for electricalmachines which is in its nature an improvement upon the device patentedin Letters Patent No. 389,184, of September 4, 1888. In the patentreferred to the commutator-segments consist of wire, each of which has alongitudinal fin engaging a corresponding crease or groove in theorifice, through which it is passed to prevent it from turning upon itsown axis. By my invention, however, the construction is such that theemployment of the tin and grooves is obviated. The insulator-segmentsare held in place by a common insulating-ring, and the insulating-ringis dressed fiush with the face of the commutator segments, so that thebrushes may be caused to wear to the extreme edge of thecommutator-segments without scoring a groove in them, such as wouldimpair the properadj ustment of other brushes.

In carrying out my invention, A represents the shaft of an electricgenerator or motor.

B is the commutator-head, to which the commutator-segments O areattached. The

commutator-head B is of hard rubber, vitreous fiber, or other insulatingmaterial, bored 1011- gitudinally for the insertion of the segments 0,which are simply cylindrical rods or wires adapted to fit the saidbores.

D is a ring or collar of insulating material, fitted over the end of thecommutator-head and the corresponding ends of the segments 0, the saidhead and segments being rabbeted for the reception of the ring orcollar. The said connnutator-head is then turned down in a lathe, so asto leave the annular shoulder (Z embracing one end of the segments, andfrom which the segments project, so as to be engaged with the wires ofthe armature. The body of the commutator-head is turned down until thewires O are exposed and made to constitute coninmtator-segments, asindicated at c. The collar D is likewise dressed flush with the surfaces0 of the commutator-segments. It is thus seen that the segments are heldagainst revolving about their own axes by the band D. At the same timethe commutator-brushes may be caused to bear clear out upon the saidband I), thus causing the surfaces of the segments to be uniformly wornand prevent the brushes from wearing a groove down into the face of thesegments. This construction also facilitates the ready oiling and wipingoff of the face of the commutator while the machine is in motion.

\Vhat I claim is- 1. A commutator consisting of the head B, ofnon-conducting material, and rods 0, the head having the integralshoulder through which the rods are passed, said head and rods turneddown to expose segment-faces c, and

in connection therewith the band D, of insulating material, embracingthe head and segments and dressed fiush with the faces 0, substantiallyas described.

2. The commutator consisting of the head B segment-rods O c, and anannular recess formed 011 the end of the head B and rods 0, and inconnection therewith a band of insulating material adapted to fit thesaid recess and hold the rods from displacement, substantially asdescribed.

In testimony whereof I sign this specification in the presence of twowitnesses.

HARRY II. BLADES.

IVitnesses:

M. B. ODoeHERTY, W. H. CHAMBERLIN.

